More variety would really help with the creature count
Not only does the end step trigger potentially draw you a card each turn, Curiosity and its many variants also work for oodles of card advantage
Even strategies built around Oil Counters, Shield Counters, Charge Counters, or Sagas become much clunkier, since your opponents are only getting a fraction, and sometimes even none , of the value those cards were supposed to provide
It doesnt matter how well your commander helps you build a board state or rewards you for it if you cant close things out
Keep in mind, the effect will happen before damage
And then you get to start making 4/4 Dragon Elementals with flying and prowess every time you manage to get two cards cast on a single turn